From MLB.com:

The Minnesota Twins announced today that they have acquired second baseman Bret Boone and cash from the Seattle Mariners in exchange for a player to be named later.

Boone, 36, was batting .231 (63-273) with 30 runs, 15 doubles, three triples, seven homers and 34 rbi in 74 games for the Mariners this season. He had a .299 on-base percentage and a .385 slugging percentage before being designated for assignment by the Mariners on July 3.

Here's a link to his career stats.

More from the Seattle Times:

Bret Boone, designated for assignment eight days ago, was traded this morning to the Minnesota Twins, according to a source at the All-Star Game in Detroit.

The move, which may bring the Seattle Mariners very little in return, if anything, was said to have been completed just hours before Seattle officials were to place the 36-year-old second baseman on irrevocable waivers that would officially have severed his ties to the Mariners and made him a free agent.

Here's the blurb from the PiPress:

Terms of the deal were not immediately known, but Seattle is thought to be paying the remaining $4.6 million on Boone's contract -- minus the pro-rated major-league minimum ($316,000) that Boone’s new club would be required to pay.

More to come. Many thanks to T-Mac for the heads up, and to the good folk at The Dickie Thon Fan Forum for the leads.